FMVSS 139

New Pneumatic Radial Tires for Light Vehicles

This Standard applies to new pneumatic tires for use on MPVs, trucks,
trailers and buses with a GVWR of 10,000 lbs. (4,536 kg) or less and that were
manufactured after 1975. It specifies tire dimensions, test requirements,
labeling requirements and defines tire load ratings.